The app will have some really cool stuff for game developers as well. Pretty excited for the official release. The whole project is opensource, you can check it out here: https://github.com/itchio/itchio-app
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In fact, if you're curious, you should check out our whole GitHub organization: https://github.com/itchio
It's mostly modern JavaScript (ES2015), Go and a bit of C right now. Documentation is severely lacking as pretty much everything is under heavy development.